TeX source:

\begin{array}{|l|lllll} 0 & & & & & & \\ 1 & 8 & 8 & & \\ 2 & 1 & 3 & 6 &6 &7&7&9 \\ 3 & 1& 7 & & & \\ 4 & 1 & 4 & 5 & 7 & & \\ 5 & 0 & 3 & & \end{array}